160MPa super-strength concrete with high cracking resistance and high fluidity

Abstract

The invention relates to 160MPa super-strength concrete with high cracking resistance and high fluidity to meet performance requirements such as premixing production, on-site pumping construction and anti-bounce capability. The concrete comprises the following components by weight (kg / cm<3>): 645-680kg of cement, 280-300kg of mineral powder, 160-190kg of coal ash, 252-283kg of silica ash, 980-1,080kg of natural sand, 238-260kg of steel fiber, 40-48kg of an additive and 160-169kg of mixing water, wherein the additive is a high-performance polycarboxylic water reducer. The slump flow of the concrete is kept within 750mm+ / -50mm within 3h, the 56d normal-curing compression strength is above 160MPa, the 56d normal-curing breaking strength is above 25MPa, and the concrete can be produced and prepared in a large scale on the basis of a common concrete mixing technology and can be transported to a construction site within 25km by a mixer truck. According to the 160MPa super-strength concrete, the problems of large-scale automatic production and preparation and remote on-site pumping and pouring construction are solved, and abundant ultrafine natural sand accumulated in the Yangtze River basin can be fully utilized.

Description

technical field [0001] The invention relates to building materials, in particular to a high-crack-resisting, high-fluidity ultra-high-strength 160MPa concrete, which is mainly used for concrete structural parts with special requirements such as bullet-proof roof penetration. Background technique [0002] Compared with ordinary concrete, high-strength concrete and steel, 160MPa ultra-high-strength concrete, as a new type of high-tech concrete, has the advantages of ultra-high strength and high durability, and its performance is better than ordinary concrete and existing high-performance concrete. With a qualitative leap, ultra-high compressive strength and flexural strength, it effectively solves the high brittleness of ordinary high-performance concrete, and is superior to steel in terms of economy and environmental protection. It has broad development potential and application prospects, and is a modern One of the main development directions of concrete. [0003] However, ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems in the prior art that the ultra-high-strength 160MPa concrete is not suitable for the production of concrete by the existing concrete mixing plant preparation process, cannot be transported over long distances, and cannot be pumped on site for construction, and provides a new type of concrete with high crack resistance. , High fluidity ultra-high strength 160MPa concrete